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Markdown Linter

Find structure problems in Markdown, reported with the line and column of each issue.

Your Markdown

Issues: —

Report

—
Headings, lists, code fences and tables are all checked, and text inside code fences is left alone.

How to use the Markdown Linter

  1. Paste the Markdown document you want to check.
  2. Click Lint to scan headings, lists, fences, tables and links.
  3. Read each issue with its line and column, then fix them in order.

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Frequently Asked Questions

Common questions about the free online markdown linter.

It looks at document structure: heading order, blank lines around blocks, trailing whitespace, code fence balance and unlinked URLs.
Skipping from a level two heading straight to level four breaks the document outline that readers and screen readers rely on.
One. A page should have a single level one heading, so any further level one heading is reported.
Two trailing spaces force a line break in Markdown and stray spaces create noisy diffs, so each one is reported with its column.
A plain web address that is not wrapped in angle brackets or a markdown link. Some renderers link it, others leave it as text.
No. Everything between a pair of fences is ignored so that sample code is never flagged for trailing spaces or bare URLs.
No. Linting runs entirely in your browser, so your text never leaves your device.
Yes, the Markdown linter is completely free and unlimited, with no account required.

Last updated: October 10, 2026